A method for mitigating water invasion to a submersible motor includes: forming an accumulation zone within an inner space of the submersible motor, wherein the accumulation zone is disposed at a bottom of the inner space below a motor shaft; measuring a conductivity of a fluid inside the accumulation zone using a sensor, wherein the fluid comprises water and dielectric oil; comparing the conductivity of the fluid with a threshold value; upon detecting that the conductivity of the fluid is greater than the threshold value, activating a solenoid pump to discharge the fluid from the accumulation zone to an outside of the submersible motor.

The present invention relates to a fluid level sensor-attached motor pump for a washer fluid, in which a fluid level sensor for detecting the remaining amount of a washer fluid stored in a washer fluid reservoir and outputting a detection signal is integrally mounted to a motor pump for a washer fluid so that an operator can check the remaining amount of the washer fluid through a dashboard of a vehicle and thus can replenish an insufficient washer fluid, in which the fluid level sensor is integrally mounted to the motor pump for a washer fluid to solve a problem in that the motor pump and the fluid level sensor are separately wiring-connected to the washer fluid reservoir to thereby deteriorate workability of wiring so that workability of wiring can be increased and the wiring can be simplified to reduce a defective proportion, in which the motor pump for a washer fluid and the fluid level sensor are integrally manufactured so that the manufacturing cost can be reduced, and in which the fluid level sensor for detecting the remaining amount of a washer fluid and outputting a detection signal is manufactured by selecting any one of a combination of a magnet and a Hall sensor, a combination of a magnet and a reed switch, and a combination of a Hall sensor and a buoyancy device mounted with a magnet so that the improvement in performance can be achieved through the use of a magnetic Hall sensor having reliability.

A control system for an operable system such as a flow control system or temperature control system. The system operates in a control loop to regularly update a model with respect at least one optimizable input variable based on the detected variables. The model provides prediction of use of the input variables in all possible operation points or paths of the system variables which achieve an output setpoint. In some example embodiments, the control loop is performed during initial setup and subsequent operation of the one or more operable elements in the operable system. The control system is self-learning in that at least some of the initial and subsequent parameters of the system are determined automatically during runtime.

A well production method uses side gas lift valves above a packer and an ESP below the packer. In a gas lift mode, a controller turns the ESP motor off, and shifts a tubing valve below the packer to a gas lift position while flowing gas down the casing. While in the gas lift mode, a pressure gauge monitors motor lubricant pressure, which correlates with a flowing bottom hole pressure of the well fluid in the lower casing annulus. In an ESP mode, the controller stops the flow of gas from the gas source, shifts the tubing valve to an ESP position and turns on the motor, causing well fluid to flow through the pump intake. The pressure gauge continues to monitor the lubricant pressure during the ESP mode.

A pressure boosting system and a method of using the same to increase fluid pressure in a fluid distribution system are disclosed. The pressure boosting system may be installed “in-line” with the fluid distribution system.

A system (16) for pumping a fluid, comprising: a pump (17) comprising a suction side (18) and a discharge side (19); a motor (20) for driving the pump, which motor is drivingly connected to the pump via a shaft (21); a return line (23) providing a feed-back conduit for the fluid from the discharge side to the suction side; a control valve (24) controlling the flow of the fluid through the return line; and a first sensor device (27) for monitoring a first system parameter which is a function of the differential pressure across the pump. The system further comprises: a second sensor device (28) for monitoring a second system parameter which is a function of the torque of the pump; and a control unit (25) arranged to: receive monitored first system parameter values from the first sensor device and, for each monitored first system parameter value, identify a minimum allowable second system parameter value; receive monitored second system parameter values from the second sensor device and, for each monitored second system parameter value, compare the monitored second system parameter value with the identified minimum allowable second parameter value; and regulate the control valve such that the monitored second parameter value does not fall below the minimum allowable second parameter value. A method of operating such a system is also disclosed.

A method of operating a system (16) for pumping a fluid, which system comprises: a pump (17) for pumping the fluid; and a variable speed motor (20) for driving the pump (17). The method comprises the steps of: identifying a first system parameter (PI); identifying a second system parameter (P2) which is a function of the torque of the pump; setting a target value (P1.sub.0) for a first system parameter; monitoring the first system parameter (PI); establishing a target value (P2o) for the second system parameter based on the difference between the target value and the measured value of the first system parameter; monitoring the second system parameter; and regulating the rotational speed of the pump such that the difference between the monitored value and the target value of the second system parameter is minimised. A system for implementing the method is also disclosed.

A motor drive and method to control a motor in a fluid system. The method may comprise determining a pressure; determining a proportional error as a limited difference between the pressure and a pressure setpoint; determining an integral step as a limited proportional error; determining an integral error as a limited sum of the integral step and a preceding unbound integral error; determining an error as the product of the integral error, the proportional error, and a gain factor; and generating a control signal to cause the inverter to output a motor voltage to drive the motor and maintain the pressure about the pressure setpoint.

The present disclosure relates generally to well operations. The present disclosure relates more particularly to a systems and methods for independently and/or simultaneously treating multiple wells from a centralized location using a split flow pumping system configuration. The split flow pumping system configuration may comprise one or more blenders, one or more boost pumps, a pumping system comprising one or more pumps, a component storage system, and a fluid storage system for treatment of two or more wells using two or more treatment compositions. The split flow pumping system configuration may comprise one or more controllers for controlling the one or more blenders, the one or more boost pumps, the pumping system comprising one or more pumps, the component storage system, and the fluid storage system. The system may comprise one or more sensors for collecting data corresponding to the one or more pressures, flow rates, injection rates, compositions, temperatures, and densities of at least one of the first composition and the second composition, wherein the controller controls the one or more pressures, flow rates, injection rates, compositions, temperatures, and densities of at least one of the first composition and the second composition based, at least in part, on the data.

A circulation pump assembly (22) includes an electrical drive motor (10) and an electronic control device (12) controlling the drive motor (10). The control device (12) is configured for the speed control of the drive motor (10) according to a control schema (I, II, III). The control device (12) includes a detection function (42) which is configured to detect a condition variable representing an operating condition, from a parallel flow path (16, 18, 20) with a second circulation pump assembly (22). The control device (12) is also configured such that it can change the control schema (I, II, III) on the basis of a condition variable detected by the detection function (42). Further an arrangement of at least two such circulation pump assemblies (22) and a method for the control of such two circulation pump assemblies (22) are provided.